Delete a category folder inside Notes.
AI agents call delete_category to permanently remove resources in Nextcloud Notes — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently removes a category folder from Nextcloud Notes. Deletion is irreversible and destroys data without an undo mechanism. While the blast radius is limited to a single category's data rather than the entire system, it is still a destructive operation that cannot be recovered. This places it in the Destructive category with high severity.
From the tool's definition Tool name: delete_category. Description: 'Delete a category folder inside Notes.' The verb 'delete' explicitly indicates irreversible removal of data (a category folder and likely its contents).
Attacks that exploit this kind of access
Delete a category folder inside Notes. It is categorised as a Destructive tool in the Nextcloud Notes MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Nextcloud Notes MCP server in PolicyLayer and add a rule for delete_category: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Nextcloud Notes. Nothing to install.
delete_category is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the delete_category rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for delete_category. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
delete_category is provided by the Nextcloud Notes MCP server (rncz/nextcloud-notes-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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